Bug 1755220 - [devtools] Fix add test second param in browser_storage_cookies_add.js.

Differential Revision: https://phabricator.services.mozilla.com/D142309

devtools/client/storage/test/browser_storage_cookies_add.js

@@ -22,7 +22,7 @@ add_task(async function() {
     private: true,
   });
   ok(PrivateBrowsingUtils.isWindowPrivate(privateWindow), "window is private");
-  const privateTab = await addTab(TEST_URL, privateWindow);
+  const privateTab = await addTab(TEST_URL, { window: privateWindow });
   await openStoragePanel({ tab: privateTab });
   await performAdd(["cookies", "http://test1.example.org"]);
   await performAdd(["cookies", "http://test1.example.org"]);